Results 151 to 160 of about 61,413 (290)

The six operations in topology

open access: yesJournal of Topology, Volume 18, Issue 4, December 2025.
Abstract In this paper, we show that the six functor formalism for sheaves on locally compact Hausdorff topological spaces, as developed, for example,‐ in Kashiwara and Schapira's book Sheaves on Manifolds, can be extended to sheaves with values in any closed symmetric monoidal ∞$\infty$‐category which is stable and bicomplete. Notice that, since we do
Marco Volpe
wiley   +1 more source

Random dynamics of fractional stochastic retarded FitzHugh–Nagumo systems on unbounded domains

open access: yesJournal of Inequalities and Applications
In this paper, we study the dynamics of fractional nonautonomous stochastic FitzHugh–Nagumo systems with variable delay defined on R n $\mathbb{R}^{n}$ .
Dongjie Gao
doaj   +1 more source

Persistence of unknottedness of clean Lagrangian intersections

open access: yesJournal of Topology, Volume 18, Issue 4, December 2025.
Abstract Let Q0$Q_0$ and Q1$Q_1$ be two Lagrangian spheres in a six‐dimensional symplectic manifold. Assume that Q0$Q_0$ and Q1$Q_1$ intersect cleanly along a circle that is unknotted in both Q0$Q_0$ and Q1$Q_1$. We prove that there is no nearby Hamiltonian isotopy of Q0$Q_0$ and Q1$Q_1$ to a pair of Lagrangian spheres meeting cleanly along a circle ...
Johan Asplund, Yin Li
wiley   +1 more source

Pullbacks in the Channel

open access: yes
Last week, negotiations for a new UK–France agreement culminated in the announcement of a 'one in, one out' pilot scheme, under which the UK will return small boat arrivals to France while accepting asylum seekers selected from France who can demonstrate family ties in Britain. The agreement signals a sui generis evolution in European migration control.
Pirrello, Agostina, Bartolini, Silvia
openaire   +2 more sources

Index pairings for pullbacks of C*-algebras [PDF]

open access: bronze, 2012
Ludwik Dąbrowski   +4 more
openalex   +1 more source

On the U-WPF Acts over Monoids [PDF]

open access: yesJournal of Sciences, Islamic Republic of Iran, 2007
Valdis Laan in [5] introduced an extension of strong flatness which is called weak pullback flatness. In this paper we introduce a new property of acts over monoids, called U-WPF which is an extension of weak pullback flatness and give a classification ...
A. Golchin
doaj  

Homotopy groups of pullbacks of varieties [PDF]

open access: bronze, 1986
Andrew J. Sommese, A. Van de Ven
openalex   +1 more source

Examining Pipe–Borehole Wall Contact and Pullback Loads for Horizontal Directional Drilling

open access: yesApplied Sciences
Pipeline pullback load is a crucial basis for drill rig selection and pipeline strength design. This paper presents a new pullback load calculation model from the perspective of pipe–borehole wall contact. The pipe–borehole wall contact analysis includes
Zhiyu Wang, Changming Hu
doaj   +1 more source

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